$ git clone -n https://src.fedoraproject.org/rpms/xkill.git /var/lib/mock/f45-build-38906-730/root/chroot_tmpdir/scmroot/xkill
Cloning into '/var/lib/mock/f45-build-38906-730/root/chroot_tmpdir/scmroot/xkill'...
$ git fetch origin 6d60cef0829abf137b39988201150c974bf93ad8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xkill
 * [new ref]         6d60cef0829abf137b39988201150c974bf93ad8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d60cef Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild